#!/usr/local/bin/python3
# -*- coding: UTF-8 -*-
"""
@author:apple
@file:Animal.py
@time:2021/09/02
"""
import os
class A:

    def __init__(self):
        print('A')

class Animal(A):

    def __init__(self):
        print('Animal')


class Dog(Animal):

    def __init__(self):
        super(Animal, self).__init__()
        print('Dog')


if __name__ == '__main__':
    pass
    # Dog()
    print(os.getgrouplist('root'))